|Object name:||Constellation:||Coordinates:||Apparent size:||Visual brightness:|
|Messier 10 (NGC 6254)||Ophiuchus||16h57m / -04°06'||20'||6.6 mag|
The globular cluster Messier 10 (NGC 6254) in the constellation Ophiuchus. Messier 10 is the second brightest globular cluster in Ophiuchus and is estimated to be 14,300 light-years away from Earth. Its spatial diameter is approximately 83 light-years. Messier 10 was discovered by French astronomer Charles Messier in 1764 (source: Wikipedia).
Twenty-three 3-minute exposures (75 minutes total exposure) at ISO 800 taken on May 21 / 22, 2020 were added for this shot with the DeepSkyStacker software and the final image processing was done in Photoshop.
Equipment: Canon EOS 450D Baader modified camera, TeleVue Paracorr Type II coma corrector, 16" f/4.5 "Ninja" dobsonian telescope riding on a dual-axis Tom Osypowski equatorial platform, Lacerta MGEN autoguider, Lacerta off axis system (field of view comparison: image of the moon with the same equipment).